CN112104432B - Time verification method, system, base station and bearing network in mobile communication network - Google Patents
Time verification method, system, base station and bearing network in mobile communication network Download PDFInfo
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- CN112104432B CN112104432B CN201910520553.2A CN201910520553A CN112104432B CN 112104432 B CN112104432 B CN 112104432B CN 201910520553 A CN201910520553 A CN 201910520553A CN 112104432 B CN112104432 B CN 112104432B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0644—External master-clock
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- H—ELECTRICITY
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- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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Abstract
The embodiment of the invention relates to the technical field of communication and discloses a time verification method, a system, a base station and a bearing network in a mobile communication network. The method comprises the following steps: a base station deploying the GPS calculates the relative deviation between the GPS timestamp and the 1588 v2 timestamp, and sends a message generated by the relative deviation to bearing network equipment which is in butt joint with the base station; the carrying network equipment performs validity verification on the message, extracts the relative deviation between the GPS timestamp and the 1588 v2 timestamp when the message is valid, and sends the relative deviation to a clock network management server; and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588 v2 synchronization failure of the message which fails the stability verification. By the mode, the reliability of the base station time scheme is improved, and meanwhile, the construction and maintenance cost of signal transmission is low.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a time verification method, a system, a base station and a bearing network in a mobile communication network.
Background
In a mobile communication network, a wireless base station based on a TDD (Time Division Duplexing, time division duplex) system needs to meet strict time synchronization requirements, otherwise, a wireless signal sent by the base station will form interference to other base stations. To achieve time synchronization between base stations, there are generally two schemes:
in one scheme, a GPS (Global Positioning System ) device is deployed on each base station to acquire a time source directly from a satellite (as shown in fig. 1). The scheme has high precision, but has the following problems: 1. difficult to install and select, especially indoor coverage base stations; 2. the maintenance is difficult, the fault rate of the GPS system is high, and the GPS system needs to be on-site maintained when the GPS system fails; 3. the feeder is difficult to lay, an amplifier is needed to be additionally arranged when the feeder is longer, feeding is considered, the feeder of the indoor coverage base station is long, and the situation is more complex; 4. the cost is high, each base station needs to be provided with a set of GPS system, and the construction cost is high; when the GPS fails, repair is generally required to be completed within 24 hours, and the maintenance cost is high.
In the second scheme, a ground 1588v2 time synchronization network is deployed, that is, a time source is accessed to a wireless core node, and time is transmitted to each base station through a bearer network 1588v2 technology, so that time synchronization of all base stations is achieved (as shown in fig. 2), wherein 1588BC is 1588 Boundary Clock (BC). The technical principle of 1588v2 is as follows: 1588 The v2 protocol, also called PTP (Precision Time Protocol ), is an accurate time synchronization protocol, which can achieve time synchronization of multiple network devices. The key idea is to encode time information by using a master-slave clock mode, and realize master-slave time synchronization by bidirectional interaction of message information by using network symmetry and delay measurement technology.
As shown in fig. 3, sync, follow_up, delay_req, delay_resp messages are sent between the Master clock (Master) and the Slave clock (Slave). From the clock, the Delay between Slave and Master (Delay) and the time difference between Slave and Master (Offset) can be calculated by 4 values of T1, T2, T3, T4. The slave clock achieves synchronization with the master clock by calibrating the local timestamp with the offset. Where t2-t1 and t4-t3 are times of signal reception, which include time of signal transmission (delay) and time-in-flow Offset (Offset), and when the signal is received by Slave at time t2, the time has naturally elapsed, so that t2-t1 and t4-t3 consist of delay and Offset, t2-t1=delay-Offset, and t4-t3=delay+offset. Therefore, delay= (t2-t1+t4-t 3)/2, offset= (t4-t3-t2+t1)/2.
The 1588v2 protocol defines a BMC (Bayesian Model Combination ) algorithm, and the slave clock support selects the best master clock from a plurality of master clocks as a tracking time source, so that the reliability is high. However, the 1588v2 protocol principle requires that the time delay of the bidirectional link between the master clock and the slave clock must be symmetrical, if the offset value calculated by the asymmetry algorithm is inaccurate, the synchronization accuracy of the master clock and the slave clock will be reduced, and it is particularly important how to measure the asymmetry value of the link.
In actual network deployment, the bidirectional link delay asymmetry mainly stems from optical fiber asymmetry, and the common practice for measuring the optical fiber asymmetry is to use an expensive time synchronization tester and an oscilloscope for time error measurement. On one hand, because measurement is needed between each pair of master and slave devices, the measurement workload is huge; on the other hand, the time synchronization tester, the oscillograph and other related instruments are inconvenient to carry by engineering personnel, and require professional personnel to operate; these engineering deployment difficulties result in 1588v2 deployment costs that are too high to be universally generalized.
The base station GPS solution and the ground 1588v2 solution have respective advantages and disadvantages: the base station GPS scheme has high precision, but weak reliability and high networking and maintenance cost; the ground 1588v2 scheme is high in reliability, but the asymmetric measurement of the optical fiber is high in cost.
Disclosure of Invention
In view of the foregoing, embodiments of the present invention provide a time verification method, system, base station and bearer network in a mobile communication network, which overcomes or at least partially solves the foregoing problems.
According to an aspect of an embodiment of the present invention, there is provided a time authentication method in a mobile communication network, the method including: selecting part of base station deployment GPS as a base station time source; a time server is deployed in a core network machine room and used as a ground time synchronization network source, a 1588v2 protocol is switched on hop by hop for a bearing network, and the time source provided by the time server is transmitted to a base station hop by hop from core layer equipment, a convergence layer equipment and access layer equipment; a base station deploying the GPS calculates the relative deviation between the GPS time stamp and the 1588v2 time stamp, and sends a message generated by the relative deviation to bearing network equipment which is in butt joint with the base station; the carrying network equipment performs validity verification on the message, extracts the relative deviation between the GPS timestamp and the 1588v2 timestamp when the message is valid, and sends the relative deviation to a clock network management server; and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
According to another aspect of the embodiments of the present invention, there is provided a time authentication method in a mobile communication network, the method including: a base station deploying the GPS calculates the relative deviation between the GPS time stamp and the 1588v2 time stamp; and sending the relative deviation generation message to a bearing network system which is in butt joint with the message, so that the bearing network system can carry out validity verification and stability verification on the message.
In an alternative manner, the calculating the relative deviation between the GPS timestamp and the 1588v2 timestamp further includes: receiving, by a GPS time receiver unit, a GPS time stamp; generating 1588v2 time stamps by a PTP time generating unit; the relative deviation between the GPS time stamp and the 1588v2 time stamp is compared by the GPS time stamp and 1588v2 time stamp comparison unit.
In an alternative manner, the steps of calculating the relative deviation and sending the message by the GPS-deployed base station are performed continuously.
According to another aspect of the embodiments of the present invention, there is provided a time authentication method in a mobile communication network, the method including: the method comprises the steps that a bearer network device in a bearer network system performs validity verification on a message sent by a base station deploying GPS, extracts relative deviation between a GPS time stamp and a 1588v2 time stamp when the message is valid, and sends the relative deviation to a clock network management server in the bearer network system, wherein the message is generated by the relative deviation between the GPS time stamp and the 1588v2 time stamp calculated by the base station deploying GPS; and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
In an optional manner, the clock network management server performs stability verification on the message, and determines that the base station to which the message does not pass the stability verification is failed in GPS or in 1588v2 synchronization, and further includes: if the jitter of the relative deviation between the GPS timestamp and the 1588v2 timestamp from the same base station exceeds a preset performance threshold range, determining that the relative deviation between the GPS timestamp and the 1588v2 timestamp is an invalid value; and if at least 2 invalid values appear in the preset period, judging whether the base station GPS failure or the base station 1588v2 synchronization failure to which the relative deviation between the GPS time stamp and the 1588v2 time stamp belongs.
According to another aspect of an embodiment of the present invention, there is provided a time verification system in a mobile communication network, the system including: a base station deployed with a GPS, wherein the GPS serves as a base station time source; the load-bearing network comprises load-bearing network equipment and a clock network management server, a time server serving as a ground time synchronization network source is deployed in a core network machine room in the load-bearing network, wherein the load-bearing network is in hop-by-hop communication with 1588v2 protocol, and the time source provided by the time server is transmitted from the core layer, the convergence layer and the access layer equipment to the base station hop by hop;
A base station deploying the GPS calculates the relative deviation between the GPS time stamp and the 1588v2 time stamp, and sends a message generated by the relative deviation to bearing network equipment which is in butt joint with the base station; the carrying network equipment performs validity verification on the message, extracts the relative deviation between the GPS timestamp and the 1588v2 timestamp when the message is valid, and sends the relative deviation to a clock network management server; and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
According to another aspect of an embodiment of the present invention, there is provided a base station including: the time stamp comparison unit is used for calculating the relative deviation between the GPS time stamp and the 1588v2 time stamp; and the message receiving and transmitting unit is used for transmitting the relative deviation generation message to a bearing network system which is in butt joint with the message receiving and transmitting unit, so that the bearing network system can carry out validity verification and stability verification on the message.
According to another aspect of the embodiment of the present invention, there is provided a bearer network, including a bearer network device and a clock network management server, wherein: the bearer network equipment performs validity verification on a message sent by a base station for deploying GPS, extracts the relative deviation between a GPS time stamp and a 1588v2 time stamp when the message is valid, and sends the relative deviation to a clock network management server in a bearer network system, wherein the message is generated by the relative deviation between the GPS time stamp and the 1588v2 time stamp calculated by the base station for deploying GPS; and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
According to another aspect of an embodiment of the present invention, there is provided a network device including: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete communication with each other through the communication bus; the memory is configured to store at least one executable instruction that causes the processor to perform operations of the time validation method in a mobile communications network as described above.
According to another aspect of embodiments of the present invention, there is provided a computer storage medium having stored therein at least one executable instruction for causing a processor to perform the operations of the time verification method in a mobile communication network as described above.
According to the embodiment of the invention, the time verification is carried out through the cooperative deployment of the base station GPS and 1588v2, the relative deviation between the GPS timestamp and the 1588v2 timestamp is calculated through the base station, the message generated by the relative deviation is sent to the bearing network equipment which is in butt joint with the base station GPS and 1588v2 timestamp, the bearing network equipment carries out the validity verification on the message, when the message is valid, the relative deviation between the GPS timestamp and the 1588v2 timestamp is extracted and sent to the clock network management server, the clock network management server carries out the stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure which the message does not pass the stability verification are judged. The base station measures the asymmetric errors of the optical fibers and can timely find out failure of GPS or 1588v2 through reliable uploading errors of the 1588v2 on the ground, reliability of a time scheme of the base station is improved, and meanwhile, construction and maintenance costs of signal transmission are low.
The foregoing description is only an overview of the technical solutions of the embodiments of the present invention, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present invention can be more clearly understood, and the following specific embodiments of the present invention are given for clarity and understanding.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 illustrates a schematic diagram of a prior art GPS deployment scenario;
FIG. 2 shows a schematic diagram of a prior art 1588v2 deployment scenario;
FIG. 3 is a schematic diagram illustrating the prior art bi-directional interaction of message messages between master and slave clocks;
fig. 4 is a schematic deployment diagram of a time verification system in a mobile communication network according to an embodiment of the present invention;
fig. 5 is a block diagram showing a time verification system in a mobile communication network according to an embodiment of the present invention;
Fig. 6 is a flowchart of a time verification method in a mobile communication network according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a time verification method in a mobile communication network according to another embodiment of the present invention;
fig. 8 is a flowchart illustrating a time verification method in a mobile communication network according to another embodiment of the present invention;
fig. 9 shows a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a carrier network according to an embodiment of the present invention;
fig. 11 shows a schematic structural diagram of a network device according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention provides a time verification scheme for the cooperative deployment of a base station GPS and 1588v2, integrates the advantages of the two schemes, overcomes the defects of the two schemes, and has high precision and reliability and low construction and maintenance cost. The embodiment of the invention relates to two subsystems, namely a base station and a bearing network. Fig. 4 is a schematic deployment diagram of a time verification system in a mobile communication network according to an embodiment of the present invention, where, as shown in fig. 4, the system needs to be built with two parts:
1. And (3) building a base station GPS: for a base station (such as a macro station) with a newly selected station address and higher reliability requirements, a GPS is deployed as a base station time source; the method comprises the steps of sharing a site with an old base station, and separating a path of GPS signal from an original GPS source by a GPS power divider to serve as a time source of a newly built base station when the old base station is deployed with a GPS; the transmission time of the ground 1588v2 synchronization mode is selected for the base stations with low reliability requirements or without GPS deployment (such as small base stations deployed for blind supplement, or indoor micro base stations and the like).
2) Ground 1588v2 network construction: and a time server is deployed in a core network machine room and used as a source of a ground time synchronization network, a bearer network hop-by-hop communication 1588v2 protocol is adopted, and the time source is transmitted from core layer equipment, convergence layer equipment and access layer equipment to a base station hop-by-hop.
The base station for deploying the GPS supports two synchronization modes of the GPS and 1588v2 to be mutually backed up, and simultaneously supports 1588v2 optical fiber asymmetric measurement, and the base station without deploying the GPS selects the 1588v2 synchronization mode.
Fig. 5 shows a block diagram of a time verification system 500 in a mobile communication network according to an embodiment of the present invention. As shown in fig. 4 and 5, the system includes a base station 510 and a carrier network 520, wherein a portion of the base station 510 is deployed with GPS as a source of base station time. The carrier network 520 includes a carrier network device 521 and a clock network management server 522, where a core network room in the carrier network 520 is deployed with a time server as a ground time synchronization network source, where the carrier network 520 is hop-by-hop with a 1588v2 protocol, and the time source provided by the time server is transferred hop-by-hop from the core layer, the convergence layer, and the access layer devices to the base station.
The following describes in detail the operation of the time verification system in the mobile communication network according to the embodiment of the present invention. Fig. 6 shows a flowchart of a time verification method in a mobile communication network according to an embodiment of the present invention, and the flowchart is a working process of a time verification system in a mobile communication network according to an embodiment of the present invention. As shown in fig. 6, the method includes:
step 601: a portion of the base station deployment GPS is selected as the base station time source.
Step 602: and deploying a time server in a core network machine room as a ground time synchronization network source, and transmitting the time source provided by the time server from core layer equipment, convergence layer equipment and access layer equipment to a base station hop by hop for a bearer network hop-by-hop through 1588v2 protocol.
Step 603: and the base station deploying the GPS calculates the relative deviation between the GPS time stamp and the 1588v2 time stamp, and sends the relative deviation generation message to the bearing network equipment which is in butt joint with the base station deploying the GPS.
And the base station for deploying the GPS has two time sources of the GPS and 1588v2, the GPS and 1588v2 protocols are started in advance before the service is started, when the GPS is stable and the 1588v2 synchronous state is locked, the relative deviation between the GPS time stamp and the 1588v2 time stamp is calculated, and a return message is generated and sent to the bearing network equipment which is in butt joint with the base station for recording. Since the common reference source of the base station GPS and the core layer time server is a satellite, and the reference source of 1588v2 is the core layer time server, the calculated relative deviation value can be understood as the total asymmetric link deviation accumulated between the core layer time server and the base station.
In this step, the steps of calculating the relative deviation and sending the message by the base station deploying the GPS are continuously performed. Specifically, the base station deploying the GPS calculates the timestamp relative deviation by:
step A1: the GPS time stamp is received by a GPS time receiver unit.
Step A2: the 1588v2 time stamp is generated by the PTP time generating unit.
Step A3: the relative deviation between the GPS time stamp and the 1588v2 time stamp is compared by the GPS time stamp and 1588v2 time stamp comparison unit.
Regarding the returned message, the embodiment of the invention adopts the Signaling message defined by 1588v2 protocol as the returned message, so that on one hand, the existing 1588 message processing flow in the existing equipment can be multiplexed to the greatest extent, and on the other hand, the application requirement can be met by only making a small amount of software change. Therefore, the scheme of the embodiment of the invention does not depend on the hardware modification of the equipment, can meet the software upgrade, has little change on the existing standard and equipment, and is simple and reliable.
Signaling message formats are shown in Table 1:
table 1Signaling Message Fields (Signaling message field)
The comparison result of the GPS timestamp and the 1588v2 timestamp is carried by a TLV (Type, value, type, length, value) triplet, and considering that only one hop exists between the base station and the bearer network docking device, the TLV Type proposal is defined as "organizatin_extension_non_forward" (Type code is 8000H), the TLV is an extensible NON-FORWARDING TLV, and is consistent with the hop-by-hop scene of 1588v2, and the format definition is described in the section 14.2.2 of the IEEE 1588-2017Draft Standard.
Table 2organization specific TLV fields (organization specific TLV field)
The various fields in table 2 are illustrated below:
1) organozationId: IEEE Standard organization assigns to suppliers or Standard organizations
OUI (Organizationally unique identifier, organization unique identifier) or CID (Communication Identifier ) identification, which may be defined as operator OUI or CID to facilitate interworking between different vendor devices.
2) organization of the organization SubType: the sub-function types under the TLV are used for TLV function expansion and can be uniformly distributed by operators.
3) dataField: the custom field is used for carrying a comparison result of the base station GPS time stamp and the 1588v2 time stamp. The format is defined as follows:
TABLE 3dataField Format definition
The meaning of each field is as follows:
message ID: the signaling message ID marks, marks the type of the current signaling message, reserves all 0 and all 1, is used for defining the signaling message ID reported by the base station GPS-1588v2 measuring result as 1, and can be defined in an expanding way according to specific application requirements at the future time;
flag: status flags. Bit 0 is used to identify whether the base station is GPS-enabled and bit 1 is used to identify whether GPS is stable. The format is as follows:
TABLE 4flag format definition
BSClockIdentity: PTP clockIdentity of the base station for identifying the identity of the base station.
offsetFrom1588toGPS: the relative deviation between the GPS timestamp and 1588v2 timestamp.
Reserved: the reserved field is reserved, and the length of the Signaling message is reserved to 128 bytes so as to meet the future possible application expansion requirement.
The calculation and uploading of the GPS and 1588v2 timestamp deviation by the base station are required to be carried out all the time and cannot be interrupted, so that the measurement result is sent to the bearing network through the Signaling message to carry out 1588 link asymmetric error recording.
Step 604: and the bearer network equipment performs validity verification on the message, extracts the relative deviation between the GPS timestamp and the 1588v2 timestamp when the message is valid, and sends the relative deviation to the clock network management server.
In this step, after receiving Signaling message, the carrier network device first makes a message validity judgment, specifically, judges whether the information such as targetPortIdentit, organizationId, organizationSubType is correct, and the correct message is a valid message, and needs to extract offsetFrom1588toGPS, and then sends the valid message to the clock network management server through the network management channel. Otherwise, discarding and reporting the invalid message alarm.
Step 605: and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
In this step, after the clock network management server receives offsetFrom1588toGPS, it needs to make stability check. The offsetFrom1588toGPS from the same base station needs to perform jitter filtering processing, if the jitter exceeds a preset performance threshold range, the value is judged to be an invalid value, further judgment is further carried out, if a plurality of invalid values occur in a preset period, the judgment is that the base station GPS fails or the base station 1588 fails synchronously, an alarm is reported, and maintenance personnel are notified to perform GPS repair. That is, the present step may perform stability verification by: if the jitter of the relative deviation between the GPS timestamp and the 1588v2 timestamp from the same base station exceeds a preset performance threshold range, determining that the relative deviation between the GPS timestamp and the 1588v2 timestamp is an invalid value; and if at least 2 invalid values appear in the preset period, judging whether the base station GPS failure or the base station 1588v2 synchronization failure to which the relative deviation between the GPS time stamp and the 1588v2 time stamp belongs.
According to the embodiment of the invention, the time verification is carried out through the cooperative deployment of the base station GPS and 1588v2, the relative deviation between the GPS timestamp and the 1588v2 timestamp is calculated through the base station, the message generated by the relative deviation is sent to the bearing network equipment which is in butt joint with the base station GPS and 1588v2 timestamp, the bearing network equipment carries out the validity verification on the message, when the message is valid, the relative deviation between the GPS timestamp and the 1588v2 timestamp is extracted and sent to the clock network management server, the clock network management server carries out the stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure which the message does not pass the stability verification are judged. The base station measures the asymmetric errors of the optical fibers and can timely find out failure of GPS or 1588v2 through reliable uploading errors of the 1588v2 on the ground, reliability of a time scheme of the base station is improved, and meanwhile, construction and maintenance costs of signal transmission are low.
According to the embodiment of the invention, the 1588v2 network optical fiber asymmetric error measurement and reporting are completed by means of the base station GPS, so that the synchronization precision of the 1588v2 scheme is improved, the cost of manual station-off measurement is saved, the stability of the base station GPS is improved, and the construction and maintenance cost of the GPS is saved. Based on high accuracy and high stability of 1588v2, the timeliness requirement of the repair GPS is reduced, and can be reduced from 24 hours to 1 week or 1 month. By reducing the time limit requirements for field processing, the required manpower is saved.
Fig. 7 is a flowchart of a time verification method in a mobile communication network according to another embodiment of the present invention, where the method is applied to a base station, and as shown in fig. 7, the method includes:
step 701: the relative deviation between the GPS time stamp and 1588v2 time stamp was calculated.
Step 702: and sending the relative deviation generation message to a bearing network system which is in butt joint with the message, so that the bearing network system can carry out validity verification and stability verification on the message.
In some embodiments, the calculating the relative deviation between the GPS timestamp and the 1588v2 timestamp further comprises:
receiving, by a GPS time receiver unit, a GPS time stamp;
Generating 1588v2 time stamps by a PTP time generating unit;
the relative deviation between the GPS time stamp and the 1588v2 time stamp is compared by the GPS time stamp and 1588v2 time stamp comparison unit.
In some embodiments, the steps of calculating the relative deviation and sending the message by the GPS-deployed base station are performed continuously.
The specific implementation process of this embodiment may refer to the foregoing embodiment of the time verification method in the mobile communication network shown in fig. 6, and will not be described herein.
According to the embodiment of the invention, the time verification is carried out through the cooperative deployment of the base station GPS and 1588v2, the relative deviation between the GPS timestamp and the 1588v2 timestamp is calculated through the base station, the message generated by the relative deviation is sent to the bearing network equipment which is in butt joint with the base station GPS and 1588v2 timestamp, the bearing network equipment carries out the validity verification on the message, when the message is valid, the relative deviation between the GPS timestamp and the 1588v2 timestamp is extracted and sent to the clock network management server, the clock network management server carries out the stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure which the message does not pass the stability verification are judged. The base station measures the asymmetric errors of the optical fibers and can timely find out failure of GPS or 1588v2 through reliable uploading errors of the 1588v2 on the ground, reliability of a time scheme of the base station is improved, and meanwhile, construction and maintenance costs of signal transmission are low.
Fig. 8 is a flowchart of a time verification method in a mobile communication network according to another embodiment of the present invention, where the method is applied to a bearer network, and as shown in fig. 8, the method includes:
step 801: the method comprises the steps that a bearer network device performs validity verification on a message sent by a base station deploying GPS, extracts the relative deviation between a GPS time stamp and a 1588v2 time stamp when the message is valid, and sends the relative deviation to a clock network management server in a bearer network system, wherein the message is generated by the relative deviation between the GPS time stamp and the 1588v2 time stamp calculated by the base station deploying GPS.
Step 802: and the clock network management server performs stability verification on the message, and judges whether the GPS of the base station to which the message belongs fails or the 1588v2 synchronization of the base station fails according to the message which fails the stability verification.
In the step, if the jitter of the relative deviation between the GPS timestamp and the 1588v2 timestamp from the same base station exceeds a preset performance threshold range, determining that the relative deviation between the GPS timestamp and the 1588v2 timestamp is an invalid value; and if at least 2 invalid values appear in the preset period, judging whether the base station GPS failure or the base station 1588v2 synchronization failure to which the relative deviation between the GPS time stamp and the 1588v2 time stamp belongs.
The specific implementation process of this embodiment may refer to the foregoing embodiment of the time verification method in the mobile communication network shown in fig. 6, and will not be described herein.
According to the embodiment of the invention, the time verification is carried out through the cooperative deployment of the base station GPS and 1588v2, the relative deviation between the GPS timestamp and the 1588v2 timestamp is calculated through the base station, the message generated by the relative deviation is sent to the bearing network equipment which is in butt joint with the base station GPS and 1588v2 timestamp, the bearing network equipment carries out the validity verification on the message, when the message is valid, the relative deviation between the GPS timestamp and the 1588v2 timestamp is extracted and sent to the clock network management server, the clock network management server carries out the stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure which the message does not pass the stability verification are judged. The base station measures the asymmetric errors of the optical fibers and can timely find out failure of GPS or 1588v2 through reliable uploading errors of the 1588v2 on the ground, reliability of a time scheme of the base station is improved, and meanwhile, construction and maintenance costs of signal transmission are low.
Fig. 9 shows a schematic structural diagram of a base station according to an embodiment of the present invention, as shown in fig. 9, the base station 900 includes:
a time stamp comparison unit 910 for calculating a relative deviation between the GPS time stamp and the 1588v2 time stamp;
And the message transceiver unit 920 is configured to send the message generated by the relative deviation to a carrier network system that is docked with the message transceiver unit, so that the carrier network system performs validity verification and stability verification on the message.
In addition, the base station 900 further comprises a GPS time receiver unit 930 for receiving GPS time stamps; a PTP time generating unit 940 for generating a PTP time stamp (i.e. 1588v2 time stamp); the message transceiver unit 920 includes a Signaling message generating unit 921 and a PTP message transceiver unit 922, where the Signaling message generating unit 921 is configured to generate a Signaling message and send the Signaling message to the PTP message transceiver unit 922, and the PTP message transceiver unit 922 sends the message to a bearer network system that interfaces with the base station 900.
According to the embodiment of the invention, the time verification is carried out through the cooperative deployment of the base station GPS and 1588v2, the relative deviation between the GPS timestamp and the 1588v2 timestamp is calculated through the base station, the message generated by the relative deviation is sent to the bearing network equipment which is in butt joint with the base station GPS and 1588v2 timestamp, the bearing network equipment carries out the validity verification on the message, when the message is valid, the relative deviation between the GPS timestamp and the 1588v2 timestamp is extracted and sent to the clock network management server, the clock network management server carries out the stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure which the message does not pass the stability verification are judged. The base station measures the asymmetric errors of the optical fibers and can timely find out failure of GPS or 1588v2 through reliable uploading errors of the 1588v2 on the ground, reliability of a time scheme of the base station is improved, and meanwhile, construction and maintenance costs of signal transmission are low.
Fig. 10 shows a schematic structural diagram of a bearer network 1000 according to an embodiment of the present invention, as shown in fig. 10, the bearer network 1000 includes a bearer network device 1010 and a clock network management server 1020, where: the carrier network device 1010 performs validity verification on a message sent by a base station deploying a GPS, extracts a relative deviation between a GPS timestamp and a 1588v2 timestamp when the message is valid, and sends the relative deviation to a clock network management server 1020 in a carrier network 1000 system, wherein the message is generated by the relative deviation between the GPS timestamp and the 1588v2 timestamp calculated by the base station deploying the GPS; the clock network management server 1020 performs stability verification on the message, and determines that the base station to which the message fails in the stability verification belongs has a GPS failure or a base station 1588v2 synchronization failure.
According to the embodiment of the invention, the time verification is carried out through the cooperative deployment of the base station GPS and 1588v2, the relative deviation between the GPS timestamp and the 1588v2 timestamp is calculated through the base station, the message generated by the relative deviation is sent to the bearing network equipment which is in butt joint with the base station GPS and 1588v2 timestamp, the bearing network equipment carries out the validity verification on the message, when the message is valid, the relative deviation between the GPS timestamp and the 1588v2 timestamp is extracted and sent to the clock network management server, the clock network management server carries out the stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure which the message does not pass the stability verification are judged. The base station measures the asymmetric errors of the optical fibers and can timely find out failure of GPS or 1588v2 through reliable uploading errors of the 1588v2 on the ground, reliability of a time scheme of the base station is improved, and meanwhile, construction and maintenance costs of signal transmission are low.
An embodiment of the present invention provides a computer storage medium having stored therein at least one executable instruction for causing a processor to perform the steps of the time verification method in a mobile communication network in any of the method embodiments described above.
An embodiment of the present invention provides a computer program product comprising a computer program stored on a computer storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the steps of the time validation method in a mobile communication network in any of the method embodiments described above.
Fig. 11 is a schematic structural diagram of a network device according to an embodiment of the present invention, which is not limited to the specific implementation of the network device according to the embodiment of the present invention.
As shown in fig. 11, the network device may include: a processor 1102, a communication interface (Communications Interface), a memory 1106, and a communication bus 1108.
Wherein: processor 1102, communication interface 1104, and memory 1106 communicate with each other via a communication bus 1108. A communication interface 1104 for communicating with network elements of other devices, such as clients or other servers. The processor 1102 is configured to execute the program 1110, and may specifically execute the time verification method in the mobile communication network in any of the above method embodiments.
In particular, program 1110 may include program code including computer-operating instructions.
The processor 1102 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present invention. The one or more processors comprised by the network device may be the same type of processor, such as one or more CPUs; but may also be different types of processors such as one or more CPUs and one or more ASICs.
Memory 1106 for storing program 1110. The memory 1106 may include high-speed RAM memory or may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
According to the embodiment of the invention, the time verification is carried out through the cooperative deployment of the base station GPS and 1588v2, the relative deviation between the GPS timestamp and the 1588v2 timestamp is calculated through the base station, the message generated by the relative deviation is sent to the bearing network equipment which is in butt joint with the base station GPS and 1588v2 timestamp, the bearing network equipment carries out the validity verification on the message, when the message is valid, the relative deviation between the GPS timestamp and the 1588v2 timestamp is extracted and sent to the clock network management server, the clock network management server carries out the stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure which the message does not pass the stability verification are judged. The base station measures the asymmetric errors of the optical fibers and can timely find out failure of GPS or 1588v2 through reliable uploading errors of the 1588v2 on the ground, reliability of a time scheme of the base station is improved, and meanwhile, construction and maintenance costs of signal transmission are low.
The algorithms or displays presented herein are not inherently related to any particular computer, virtual system, or other apparatus. Various general-purpose systems may also be used with the teachings herein. The required structure for a construction of such a system is apparent from the description above. In addition, embodiments of the present invention are not directed to any particular programming language. It will be appreciated that the teachings of the present invention described herein may be implemented in a variety of programming languages, and the above description of specific languages is provided for disclosure of enablement and best mode of the present invention.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specifically stated.
Claims (11)
1. A method of time verification in a mobile communications network, the method comprising:
selecting part of base station deployment GPS as a base station time source;
A time server is deployed in a core network machine room and used as a ground time synchronization network source, a 1588v2 protocol is switched on hop by hop for a bearing network, and the time source provided by the time server is transmitted to a base station hop by hop from core layer equipment, a convergence layer equipment and access layer equipment;
a base station deploying the GPS calculates the relative deviation between the GPS time stamp and the 1588v2 time stamp, and sends a message generated by the relative deviation to bearing network equipment which is in butt joint with the base station; the relative deviation is the total asymmetric deviation of all 1588 links between the core layer time server and the base station;
the carrying network equipment performs validity verification on the message, extracts the relative deviation between the GPS timestamp and the 1588v2 timestamp when the message is valid, and sends the relative deviation to a clock network management server;
and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
2. A method of time verification in a mobile communications network, the method comprising:
a base station deploying the GPS calculates the relative deviation between the GPS time stamp and the 1588v2 time stamp; the relative deviation is the total asymmetric deviation of all 1588 links between the core layer time server and the base station;
And sending the relative deviation generation message to a bearing network system which is in butt joint with the relative deviation generation message, so that the bearing network system can carry out validity verification and stability verification on the message, and judging that the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification is carried out.
3. The method of claim 2, wherein said calculating a relative deviation between a GPS timestamp and a 1588v2 timestamp further comprises:
receiving, by a GPS time receiver unit, a GPS time stamp;
generating 1588v2 time stamps by a PTP time generating unit;
the relative deviation between the GPS time stamp and the 1588v2 time stamp is compared by the GPS time stamp and 1588v2 time stamp comparison unit.
4. A method according to claim 2 or 3, wherein the steps of calculating the relative bias and sending the message by the GPS deployed base station are performed continuously.
5. A method of time verification in a mobile communications network, the method comprising:
the method comprises the steps that a bearer network device in a bearer network system performs validity verification on a message sent by a base station deploying GPS, extracts relative deviation between a GPS time stamp and a 1588v2 time stamp when the message is valid, and sends the relative deviation to a clock network management server in the bearer network system, wherein the message is generated by the relative deviation between the GPS time stamp and the 1588v2 time stamp calculated by the base station deploying GPS; the relative deviation is the total asymmetric deviation of all 1588 links between the core layer time server and the base station;
And the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
6. The method of claim 5, wherein the clock network management server performs stability check on the message, and determines that a base station GPS to which the message does not pass the stability check fails or a base station 1588v2 synchronization fails, further comprising:
if the jitter of the relative deviation between the GPS timestamp and the 1588v2 timestamp from the same base station exceeds a preset performance threshold range, determining that the relative deviation between the GPS timestamp and the 1588v2 timestamp is an invalid value;
and if at least 2 invalid values appear in the preset period, judging whether the base station GPS failure or the base station 1588v2 synchronization failure to which the relative deviation between the GPS time stamp and the 1588v2 time stamp belongs.
7. A time verification system in a mobile communication network, the system comprising:
a base station deployed with a GPS, wherein the GPS serves as a base station time source;
the load-bearing network comprises load-bearing network equipment and a clock network management server, a time server serving as a ground time synchronization network source is deployed in a core network machine room in the load-bearing network, wherein the load-bearing network is in hop-by-hop communication with 1588v2 protocol, and the time source provided by the time server is transmitted from the core layer, the convergence layer and the access layer equipment to the base station hop by hop;
A base station deploying the GPS calculates the relative deviation between the GPS time stamp and the 1588v2 time stamp, and sends a message generated by the relative deviation to bearing network equipment which is in butt joint with the base station; the relative deviation is the total asymmetric deviation of all 1588 links between the core layer time server and the base station;
the carrying network equipment performs validity verification on the message, extracts the relative deviation between the GPS timestamp and the 1588v2 timestamp when the message is valid, and sends the relative deviation to a clock network management server;
and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
8. A base station, comprising:
the time stamp comparison unit is used for calculating the relative deviation between the GPS time stamp and the 1588v2 time stamp; the relative deviation is the total asymmetric deviation of all 1588 links between the core layer time server and the base station;
and the message receiving and transmitting unit is used for transmitting the relative deviation generation message to a bearing network system which is in butt joint with the message receiving and transmitting unit, so that the bearing network system can carry out validity verification and stability verification on the message, and the base station GPS failure or the base station 1588v2 synchronization failure of the message which does not pass the stability verification can be judged.
9. The utility model provides a carrier network which characterized in that includes carrier network equipment and clock network management server, wherein:
the bearer network equipment performs validity verification on a message sent by a base station for deploying GPS, extracts the relative deviation between a GPS time stamp and a 1588v2 time stamp when the message is valid, and sends the relative deviation to a clock network management server in a bearer network system, wherein the message is generated by the relative deviation between the GPS time stamp and the 1588v2 time stamp calculated by the base station for deploying GPS; the relative deviation is the total asymmetric deviation of all 1588 links between the core layer time server and the base station;
and the clock network management server performs stability verification on the message, and judges the base station GPS failure or the base station 1588v2 synchronization failure of the message which fails the stability verification.
10. A network device, comprising: the device comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete communication with each other through the communication bus;
the memory is configured to store at least one executable instruction that causes the processor to perform the operations of the time validation method in a mobile communications network according to any one of claims 2 to 6.
11. A computer storage medium having stored therein at least one executable instruction for causing a processor to perform the operations of the time validation method in a mobile communications network according to any one of claims 2 to 6.
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